Asshai

Asshai, or Asshai-by-the-Shadow, is a city of Essos lying almost six thousand miles south-east of Westeros, on the far side of the known world. It is a great seaport on the eastern coast of the Jade Sea, lying at the mouth of the Saffron Straits. It lies south-east of Yi Ti, south-west of the forbidding Shadow Lands and north of the mysterious land of Ulthos. The coastlands north and east of the city are infested with ghost grass[1].

Asshai is also a trading destination for ships. The city exports goods like amber and dragonglass.